#region Copyright and Licensing Notice
// Copyright (C) 2011 Steven Bosnick
// 
// This program is open source software; you can redistribute it 
// and/or modifiy it under the terms of the Eclipse Public License,
// version 1.0.
// 
// This program is distributed in the hope that it will be useful, 
// but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A 
// PARTICULAR PURPOSE. See the Eclipse Public License for more
// details.
// 
// You should have received a copy of the Eclipse Public License 
// along with this program; if not, you can find a copy at
// "http://www.opensource.org/licenses/eclipse-1.0.php".
#endregion
using System;
using System.Threading.Tasks;
using BitwiseOre.Properties;

namespace BitwiseOre.SharedMemory.Core
{
    internal static class TaskExtentions
    {
        private static readonly string TaskNotCompletedMessage = Resources.TaskExtentions_TaskNotCompletedMessage;

        public static void TrySetFromTask<TResult>(this TaskCompletionSource<TResult> resultSetter, Task task,
                                                   Func<TResult> getResult)
        {
            switch (task.Status)
            {
                case TaskStatus.RanToCompletion:
                    resultSetter.TrySetResult(getResult());
                    return;
                case TaskStatus.Faulted:
                    resultSetter.TrySetException(
                        task.Exception.InnerExceptions);
                    return;
                case TaskStatus.Canceled:
                    resultSetter.TrySetCanceled();
                    return;
                default:
                    throw new InvalidOperationException(TaskNotCompletedMessage);
            }
        }
    }
}